Improvement in propelling boats



NITED STATES PATENT EETcE.

CHARLES DANCKER, OF HOBOKEN, NEW JERSEY.

IMPROVEMENT IN PROPELLING BOATS.

Specification forming part of Letters Patent No.1123,383, dated February 6, 1872.

Specication describing an Improvement I cause them to gradually drop from-a horizon in Propeller for Canal-Boats, invented by CHARLES DANCKER, of Hoboken, in the county of Hudson and State of New Jersey.

Figure l represents a horizontal section of a canal-boat piovided with my improved propeller. Fig. 2 is a vertical longitudinal section oi' the same. Fig. 3 is a horizontal section of a modification of the same. Fig. 4 is a longitudinal vertical section of said modification.

Similar letters of reference indicate correspondin g parts.

The invention will be first fully described, and then clearly pointed out in the claim.

In Figs. l and 2, A represents the stern porf tion of a canal-boat. In it is hung a transverse crank-shaft, B, tto which oscillating motion is imparted by means of steam or other power. 'lhe cranks a a ofthe shaft B are connected to the front ends of rods b b that extend backward through the stern of the boat, where they are packed water-tight. The motions ofthe rock-shaft B serve to move the rods b b back and forth. To the outer end of each rod b, behind the stern of the vessel, is pivoted a metallic or wooden blade, C, of suitable width and length7 the pivot-pin el being rigidly attached to the rod b. To said pin is also secured a metal or wooden plate, D, which has its ends guided in grooves or tracks e e provided in hackwardly-projecting frames E of the boat. The said frames also hold a transverse pin or friction-roller, j', upon which the blade C rests, as shown. As the rods move outwardly they push the blades C back, and

tal into a vertical position by bringing its pivot gradually nearer to the supporting-pin f. The plate D, however, always remains in a horizontal position'. The blade crowds the lnore against the water the more it is brought into a vertical position, the covering-plate D preventing the water from escaping over the top. ln moving forward the rod b draws the blade gradually into a horizontal position and prevents it from hindering an advance of the boat. F is the rudder, hung in cross-pieces g gthat connect with the projecting frame E. 011e or more rods, b, blades C, and plates D maybe applied to one boat. The space inclosed by the frames E may be closed on top il' desired.

A modification of the invention is shownin Figs. 3 and 4, in which the blade C is drawn into a pocket, G, that is formed in the stern of the boat, the projecting frames E being dispensed with. In this case tw'o rudders, H H, are preferably used near the sides of the boat, as shown.

Having thus described my invention, l claim as new and desire to secure by Letters Patent- The combination of the paddles C C, slider D D, pivot-pins d d, rods I) b, and crank-shaft B a a, as and for the purpose described.

CHARLES DANCKER.

Witnesses:

GEO. W. MABEE, T. B. MosEER. 

